working vehicle-days

例句：

1. 1.The police used a working vehicle to transport the injured people to the hospital.
   警方使用一辆工作车辆将受伤的人运送到医院。
2. 2.The construction company has several working vehicles for different tasks.
   这家建筑公司有几种不同的工作车辆用于不同的任务。
3. 3. The driver was instructed to use a working vehicle when driving on the highway.
   司机被指示在高速公路上驾驶时使用一辆工作车辆。